* the option group returned by gtk_get_option_group(),
* you don’t have to call gtk_init().
*
+ * And if you are using #GtkApplication, you don't have to call any of the
+ * initialization functions either; the #GtkApplication::startup handler
+ * does it for you.
+ *
* This function will terminate your program if it was unable to
* initialize the windowing system for some reason. If you want
* your program to fall back to a textual interface you want to